Sofa bed



FIG. 1 is a front elevational view, showing my new design for a sofa bed.

FIG. 2 is a left side elevational view thereof.

FIG. 3 is a front and side perspective view thereof.

FIG. 4 is a rear elevational view thereof.

FIG. 5 is a top plan view thereof.

FIG. 6 is a bottom plan view thereof.

FIG. 7 is a side elevational view thereof with the sofa bed in a partially extended position.

FIG. 8 is a front and side perspective view thereof with the sofa bed in a partially extended position; and,

FIG. 9 is a right side and front elevational view thereof with the sofa bed in a fully extended position. 

I claim, the ornamental design for a sofa bed, as shown and described. 